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Download the revised report (iis15R02) of this Proficiency Test on Crude Oil Assay D2892 + D5236 .

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Summary of this proficiency test:

On 29 April 2016, the proficiency test on Crude Oil Assay D2892 + D5236 (iis15R02) was finished. It started on 21 October 2015  (see message 'Proficiency Test on Crude Oil Assay D2892 + D5236 started') when the samples were distributed.

In this interlaboratory study 25 participants in 18 countries have participated.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.

In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. ISO, ASTM, EN).